Debt Disclosure [Abstract] Debt Disclosure Debt Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type Subsequent Event Type [Axis] Subsequent Event Type Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] CrossAmerica CrossAmerica [Member] CrossAmerica [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued Business Combination, Consideration Transferred Business Combination, Consideration Transferred Term of Material Contract Term of Material Contract Length of the term of a material contract Contract Margin Contract Margin Margin earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Common units Common units [Member] Restricted units, unit options, performance awards, phantom units, unit awards, unit appreciation rights, distribution equivalent rights, and other unit-based awards Phantom Share Units (PSUs) Phantom Share Units (PSUs) [Member] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Immediate vesting Immediate vesting [Member] Immediate vesting [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stock-based compensation related to CST Allocated Share-based Compensation Expense Share-based compensation arrangement by share-based payment award, number of shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Data Disclosure Quarterly Financial Information [Text Block] Income Tax Disclosure [Abstract] Statement Statement [Table] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] U.S. UNITED STATES Canada CANADA Statement Statement [Line Items] Income before income tax expense Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Property, Plant and Equipment Impairment or Disposal [Abstract] Schedule of Impaired Long-Lived Assets Held and Used [Table] Schedule of Impaired Long-Lived Assets Held and Used [Table] Impaired Long-Lived Assets Held and Used by Type [Axis] Impaired Long-Lived Assets Held and Used by Type [Axis] Impaired Long-Lived Assets Held and Used, Asset Name [Domain] Impaired Long-Lived Assets Held and Used, Asset Name [Domain] Impaired Long-Lived Assets Held and Used Impaired Long-Lived Assets Held and Used [Line Items] Asset impairments Impairment of Long-Lived Assets Held-for-use Write down of assets held-for-sale Impairment of Long-Lived Assets to be Disposed of Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Supplier Concentration Risk Supplier Concentration Risk [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Valero Energy Corporation Valero Energy Corporation [Member] Valero Energy Corporation, parent of CST Brands, Inc. prior to its separation on May 1, 2013. Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Cost of sales Related Parties Amount in Cost of Sales Operating expenses Related Party Transaction, Expenses from Transactions with Related Party General and administrative expenses Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party Inventory Disclosure [Abstract] Inventories Disclosure Inventory Disclosure [Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Senior Notes Senior Notes [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] CST Standalone CST Standalone [Member] The operations and one or more of CST’s subsidiaries without the inclusion or consolidation of the operations or subsidiaries of CrossAmerica. CST Standalone includes U.S. Retail, Canadian Retail and CST’s ownership of 100% of the outstanding incentive distribution rights of CrossAmerica Partners LP and any common units of CrossAmerica received as consideration for “asset drops” defined below. Debt Instrument [Line Items] Debt Instrument [Line Items] Senior Notes, Noncurrent Senior Notes, Noncurrent Long-term debt Long-term Debt Capital leases Capital Lease Obligations Line of Credit Facility, Fair Value of Amount Outstanding Line of Credit Facility, Fair Value of Amount Outstanding Other Long-term Debt Other Long-term Debt Long-term debt and capital lease obligations, including current maturities Long-term Debt and Capital Lease Obligations, Including Current Maturities Debt, Current Debt, Current Debt and capital lease obligations, less current portion Long-term Debt and Capital Lease Obligations Supplemental Cash Flow Information [Abstract] Interest paid in excess of amount capitalized Interest Paid, Net Federal income tax expense at the U.S. statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent U.S. state income tax expense, net of U.S. Federal income tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Canadian operations Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Credits Effective Income Tax Rate Reconciliation, Tax Credit, Percent State credit loss Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Income tax expense Effective Income Tax Rate Reconciliation, Percent Accounting Policies [Abstract] Significant Accounting Policies Disclosure Significant Accounting Policies [Text Block] Employee Stock Option Employee Stock Option [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Options outstanding at May 1, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Number of options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Number of options Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Number of unvested options forfeited Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares Number of vested options expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Weighted-average exercise price of options granted Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Weighted-average exercise price of options exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Aggregate intrinsic value of shares exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Weighted-average exercise price of unvested options forfeited Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Weighted-average exercise price of vested options expired Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Weighted-average exercise price of options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted average remaining contractual term on options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Aggregate intrinsic value of options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Number of options exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted average exercise price for options exercisable Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Weighted average remaining contractual term on for options exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate intrinsic value on options exercisable December 31,2014 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Line of Credit Facility [Table] Line of Credit Facility [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 1 Fair Value, Inputs, Level 1 [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Fair value of long-term debt Long-term Debt, Fair Value Total available credit facility limit Line of Credit Facility, Maximum Borrowing Capacity Letters of credit outstanding Letters of Credit Outstanding, Amount Maximum leverage ratio constraint Revolving Credit Facility's Maximum Leverage Ratio Constraint The constraint placed upon the revolving credit facility's borrowing capacity to ensure debt is in compliance with the leverage ratio agreed upon in the debt contract. Total available and undrawn Line of Credit Facility, Remaining Borrowing Capacity Receivables [Abstract] Receivables Disclosure Loans, Notes, Trade and Other Receivables Disclosure [Text Block] U.S. federal Current Federal Tax Expense (Benefit) U.S. state Current State and Local Tax Expense (Benefit) Canada Current Foreign Tax Expense (Benefit) Total current Current Income Tax Expense (Benefit) U.S. federal Deferred Federal Income Tax Expense (Benefit) U.S. state Deferred State and Local Income Tax Expense (Benefit) Canada Deferred Foreign Income Tax Expense (Benefit) Total deferred Deferred Income Tax Expense (Benefit) Income tax expense Income Tax Expense (Benefit) Accrued Liabilities and Other Liabilities [Abstract] Wage and other employee-related liabilities (CrossAmerica: $8 as of December 31, 2014) Employee-related Liabilities, Current Environmental liabilities Accrued Environmental Loss Contingencies, Current Self-insurance accruals Self Insurance Reserve, Current Asset retirement obligation, current Asset Retirement Obligation, Current Accrued Interest (CrossAmerica: $1 as of December 31, 2014) Interest Payable, Current Other (CrossAmerica: $12 as of December 31, 2014) Other Accrued Liabilities, Current Total accrued expenses Accrued Liabilities, Current Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Consolidation, Eliminations Consolidation, Eliminations [Member] Corporate, Non-Segment Corporate, Non-Segment [Member] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Domain] Subsegments Consolidation Items [Domain] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Concentration Risk, Percentage Concentration Risk, Percentage Operating revenues(a) Revenues Total assets Assets Receivables, net Accounts Receivable, Net, Current Number of reportable segments Number of Reportable Segments Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Condensed Financial Information of Parent Company Only Disclosure [Abstract] Condensed Financial Statements [Text Block] Condensed Financial Statements [Text Block] Stock-Based Activity [Abstract] Stock-Based Activity [Abstract] Common stock, shares, outstanding Common Stock, Shares, Outstanding Stock issuances Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Issuance of stock for the GP Purchase and IDR Purchase Issuance of stock at the spin-off Common Stock, Shares, Issued Treasury Stock, Number of Shares Held Treasury Stock, Number of Shares Held Stock repurchases Shares Paid for Tax Withholding for Share Based Compensation Stock repurchases under buyback program Treasury Stock, Shares, Acquired Accrued Expenses and Other Long-Term Liabilities Disclosure Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Noncurrent [Text Block] Statement of Financial Position [Abstract] Condensed Financial Statements Condensed Financial Statements [Table] Reportable Legal Entities Reportable Legal Entities [Member] Condensed Financial Statements Condensed Financial Statements, Captions [Line Items] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash (CrossAmerica: $15 at December 31, 2014) Cash Receivables, net of allowances of $1 and $1, respectively (CrossAmerica: $35 at December 31, 2014) Inventories (CrossAmerica: $12 at December 31, 2014) Inventory, Net Deferred income taxes (CrossAmerica: $1 as of December 31, 2014) Deferred Tax Assets, Net, Current Prepaid expenses and other (CrossAmerica: $10 at December 31, 2014) Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property and equipment, at cost (CrossAmerica: $490 at December 31, 2014) Property, Plant and Equipment, Gross Accumulated depreciation (CrossAmerica: $8 at December 31, 2014) Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net (CrossAmerica: $482 at December 31, 2014) Property, Plant and Equipment, Net Intangible assets, net (CrossAmerica: $370 at December 31, 2014) Intangible Assets, Net (Excluding Goodwill) Goodwill (CrossAmerica: $223 at December 31, 2014) Goodwill Deferred income taxes Deferred Tax Assets, Net, Noncurrent Other assets, net (CrossAmerica: $19 at December 31, 2014) Other Assets, Noncurrent Total assets LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Liabilities [Abstract] Liabilities [Abstract] Current liabilities: Liabilities, Current [Abstract] Current portion of debt and capital lease obligations (CrossAmerica: $29 at December 31, 2014) Long-term Debt and Capital Lease Obligations, Current Accounts Payable, Other, Current Accounts Payable, Other, Current Accounts payable (CrossAmerica: $31 at December 31, 2014) Accounts Payable, Current Accounts payable to Valero Accounts Payable, Trade, Current Accrued expenses (CrossAmerica: $21 at December 31, 2014) Taxes other than income taxes (CrossAmerica: $10 at December 31, 2014) Accrual for Taxes Other than Income Taxes, Current Income taxes payable Taxes Payable, Current Dividends payable Dividends Payable Total current liabilities Liabilities, Current Debt and capital lease obligations, less current portion (CrossAmerica: $261 at December 31, 2014) Deferred income taxes (CrossAmerica: $38 at December 31, 2014) Deferred Tax Liabilities, Net, Noncurrent Asset retirement obligations (CrossAmerica: $19 at December 31, 2014) Asset Retirement Obligations, Noncurrent Other long-term liabilities (CrossAmerica: $16 at December 31, 2014) Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Shareholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, 250,000,000 shares authorized at $0.01 par value; 77,674,450 and 75,599,944 shares issued as of December 31, 2014 and December 31, 2013, respectively Common Stock, Value, Issued Additional paid-in capital (APIC) Additional Paid in Capital Treasury stock, at cost; 512,714 common shares as of December 31, 2014 Treasury Stock, Value Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income (AOCI) Accumulated Other Comprehensive Income (Loss), Net of Tax Total CST Brands, Inc. shareholders' equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and shareholders’ equity Liabilities and Equity Business Combinations [Abstract] Business Combination Disclosure Business Combination Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Schedule of Minimum Lease Payments [Table Text Block] Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block] Schedule of Rent Expense [Table Text Block] Schedule of Rent Expense [Table Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill Disclosure Goodwill Disclosure [Text Block] Earnings Per Share [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Restricted stock awards Restricted Stock [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Weighted-average anti-dilutive options (in thousands) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Valero Energy Corporation Customer Concentration Risk Customer Concentration Risk [Member] Purchase of CrossAmerica GP and IDRs Payment for acquisition of General Partner ownership and Incentive Distribution Rights Cash outflow paid for acquisition of General Partner ownership of an entity and in exchange for Incentive Distribution Rights (IDR) held by the managing member or general partner, of limited liability company (LLC) or limited partnership (LP). Cost of sales for motor fuel purchases for resale from Valero- significant vendor Fuel Costs Cost of sales for motor fuel purchases for resale from Valero- related party Business Combination, Separately Recognized Transactions [Axis] Business Combination, Separately Recognized Transactions [Axis] Business Combination, Separately Recognized Transactions [Domain] Business Combination, Separately Recognized Transactions [Domain] Fair Value Adjustment from Acquisition Fair Value Adjustment from Acquisition [Member] An adjustment to fair value resulting from an acquisition. Operating revenues Gross profit Gross Profit Depreciation, amortization and accretion expense Depreciation, Depletion and Amortization, Nonproduction Operating income Operating Income (Loss) Total expenditures for long-lived assets Capital Expenditures Capital expenditures on projects. Guarantor Narrative [Abstract] Guarantor Narrative [Abstract] Deferred income taxes Property and equipment, net Intangible assets, net Goodwill Property, Plant and Equipment [Abstract] Schedule of Property and Equipment Property, Plant and Equipment [Table Text Block] Revenue from External Customers by Products and Services [Table] Revenue from External Customers by Products and Services [Table] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Motor Fuel Sales Motor Fuel Sales [Member] Motor Fuel Sales [Member] Merchandise Sales Merchandise Sales [Member] Merchandise Sales [Member] Other Product Revenues Other Product Revenues [Member] Other Product Revenues [Member] Revenue from External Customer [Line Items] Revenue from External Customer [Line Items] Intangible Assets, Net (Excluding Goodwill) [Abstract] Intangible Assets Disclosure Intangible Assets Disclosure [Text Block] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Goodwill [Line Items] Goodwill [Line Items] Goodwill Beginning Balance Goodwill from acquisitions Goodwill, Acquired During Period Goodwill Ending Balance Compensation and Retirement Disclosure [Abstract] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] CST Defined Contribution Plan CST Defined Contribution Plan [Member] CST Defined Contribution Plan [Member] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined contribution plan, employer matching contribution, percent of match Defined Contribution Plan, Employer Matching Contribution, Percent of Match Defined contribution plan, employer matching contribution, percent of employees' gross pay Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Defined contribution plan, profit sharing, percent Defined Contribution Plan, Profit Sharing, Percent Percentage of employees' gross pay for which the employer contributes, as part of profit sharing program, to a defined contribution plan. Defined Contribution Plan, Employer Discretionary Contribution Amount Defined Contribution Plan, Employer Discretionary Contribution Amount Pension and Other Postretirement Benefit Expense Pension and Other Postretirement Benefit Expense Fair Value Disclosures [Abstract] Fair Value Measurements, Nonrecurring Fair Value Measurements, Nonrecurring [Table Text Block] Schedule of Operating Leased Assets [Table] Schedule of Operating Leased Assets [Table] CST Brands Inc. CST Brands Inc. [Member] CST Brands Inc. [Member] Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] 2015 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2016 Operating Leases, Future Minimum Payments, Due in Two Years 2017 Operating Leases, Future Minimum Payments, Due in Three Years 2018 Operating Leases, Future Minimum Payments, Due in Four Years 2019 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total minimum rental payments Operating Leases, Future Minimum Payments Due Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Inventory, Current Inventory, Current [Table] Inventory Inventory [Line Items] Convenience store merchandise (CrossAmerica: $7 as of December 31, 2014) Retail Related Inventory Motor fuel (CrossAmerica: $5 as of December 31, 2014) Energy Related Inventory, Crude Oil, Products and Merchandise Supplies Inventory, Raw Materials and Supplies, Gross Inventories Property, Plant and Equipment Assets Held-for-sale Disclosure [Abstract] Schedule of Assets Held for Sale Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Benefit plan expense Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Restricted shares outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted, shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Granted, weighted-average grant-date fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested, shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited, shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Forfeited, weighted-average grant-date fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Restricted shares outstanding, weighted-average grant-date fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Cost of sales for vendor allowances and rebates Cost Of Sales Vendor Allowances Accrued Rebates Cost of Sales, Vendor Allowances, Accrued Rebates Income Taxes Disclosure Income Tax Disclosure [Text Block] Debt compliance timing [Axis] Debt compliance timing [Axis] Timing to remain in debt compliance Debt compliance timing [Domain] Debt compliance timing [Domain] [Domain] for Timing to remain in debt compliance Thereafter December 31, 2014 Thereafter December 31, 2014 [Member] Thereafter December 31, 2014 [Member] After July 2, 2014 but Prior to December 31, 2014 The fiscal quarter ending December 31, 2014 [Member] The fiscal quarter ending December 31, 2014 [Member] Two Quarters Following Closing of Material Acquisition Two Quarters Following Closing of Material Acquisition [Member] Two Quarters Following Closing of Material Acquisition Upon issuance of Qualified Senior Notes Upon issuance of Qualified Senior Notes [Member] Upon issuance of Qualified Senior Notes [Member] Interest Spread [Axis] Interest Spread [Axis] Interest Spread Interest Spread [Domain] Interest Spread [Domain] [Domain] for Interest Spread Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Federal Funds Effective Swap Rate Federal Funds Effective Swap Rate [Member] Base Rate Base Rate [Member] Debt Interest Options [Axis] Debt Interest Options [Axis] Debt interest options when multiple interest options exist. Debt Interest Options [Domain] Debt Interest Options [Domain] [Domain] for Debt interest options when multiple interest options exist. First Option First Option [Member] First option of debt interest options. Second Option Second Option [Member] Second option of debt interest options. Swing-Line Loans Swing-Line Loans [Member] Swing-Line Loans [Member] Standby Letters of Credit Standby Letters of Credit [Member] Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Debt Instrument, Maturity Date Debt Instrument, Maturity Date Line of Credit Facility, Increase (Decrease), Net Line of Credit Facility, Increase (Decrease), Net Line of Credit Facility, Remaining Borrowing Capacity Debt instrument, description of variable rate basis Debt Instrument, Description of Variable Rate Basis Debt instrument, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Debt, Weighted Average Interest Rate Debt, Weighted Average Interest Rate Line Of Credit Facility Financial Covenants Combined Leverage Ratio Line Of Credit Facility Financial Covenants Combined Leverage Ratio Maximum combined leverage ratio permitted under the line of credit facility Debt Instrument, Face Amount Debt Instrument, Face Amount Line Of Credit Facility Financial Covenants Combined Interest Charge Coverage Ratio Line Of Credit Facility Financial Covenants Combined Interest Charge Coverage Ratio Minimum combined interest coverage ratio permitted under the line of credit facility Long-term Purchase Commitment, Period Long-term Purchase Commitment, Period Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Scenario [Axis] Scenario [Axis] Scenario, Unspecified Scenario, Unspecified [Domain] Sale Leaseback Transaction Sale Leaseback Transaction [Member] The transaction involving the sale of property to another party and the lease of the property back to the seller. Property, Plant and Equipment Property, Plant and Equipment [Line Items] Depreciation expense Depreciation Property, Plant and Equipment, Net Capital Leased Assets, Gross Capital leases, accumulated depreciation Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation Common stock, shares, issued Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Basic earnings per common share Earnings Per Share, Basic Diluted earnings per common share Earnings Per Share, Diluted Supplemental Cash Flow Information Disclosure Cash Flow, Supplemental Disclosures [Text Block] Current assets Business Combination, Contingent Consideration, Asset, Current Inventories Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Property and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Intangibles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets Other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Long-term debt and capital leases Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities Deferred tax liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent Other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Non-controlling interest Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Total Consideration Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Schedule of Quarterly Financial Information [Table Text Block] Schedule of Quarterly Financial Information [Table Text Block] Cash Flow, Operating Capital [Table Text Block] Cash Flow, Operating Capital [Table Text Block] Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Land (CrossAmerica: $154 as of December 31, 2014) Land Buildings (CrossAmerica: $179 as of December 31, 2014) Buildings and Improvements, Gross Equipment (CrossAmerica: $148 as of December 31, 2014) Machinery and Equipment, Gross Leasehold improvements (CrossAmerica: $4 as of December 31, 2014) Leasehold Improvements, Gross Other Property, Plant and Equipment, Other, Gross Leasehold improvements (CrossAmerica: $4 as of December 31, 2014) Construction in Progress, Gross Property and equipment, at cost Accumulated depreciation (CrossAmerica: $8 as of December 31, 2014) Stock-Based Compensation Disclosure Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Schedule of Nonvested Performance-based Units Activity [Table Text Block] Schedule of Nonvested Performance-based Units Activity [Table Text Block] Statement of Comprehensive Income [Abstract] Consolidated net income Other comprehensive income (loss): Other Comprehensive Income (Loss), before Tax [Abstract] Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Other comprehensive income (loss) before income taxes Other Comprehensive Income (Loss), before Tax Income taxes related to items of other comprehensive income Other Comprehensive Income (Loss), Tax Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Loss attributable to noncontrolling interests Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Comprehensive income attributable to CST stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Acquisitions [Abstract] Acquisitions [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Acquisition of Nice N Easy Acquisition of Nice N Easy [Member] Acquisition of Nice N Easy [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Purchase of CrossAmerica GP and IDRs Number of stores Number of Stores Lease Rate Lease Rate The percent of value that sets a leasing rate for a property. Business Acquisitions, Purchase Price Allocation, Year of Acquisition, Net Effect on Income Business Acquisitions, Purchase Price Allocation, Year of Acquisition, Net Effect on Income Other Payments to Acquire Businesses Other Payments to Acquire Businesses Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Intersegment Eliminations Intersegment Eliminations [Member] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Parent Company Parent Company [Member] Guarantor Subsidiaries Guarantor Subsidiaries [Member] Non-Guarantor Subsidiaries Non-Guarantor Subsidiaries [Member] Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Acquisitions Payments to Acquire Business Three, Net of Cash Acquired Proceeds from the sale of assets held for sale Proceeds from Sale of Property Held-for-sale Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Acquisition Business Combination, Acquisition Related Costs Proceeds from dispositions of property and equipment Proceeds from Sale of Property, Plant, and Equipment CrossAmerica cash acquired Cash Acquired from Acquisition Other investing activities, net Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from issuance of long-term debt Proceeds from Issuance of Long-term Debt Payments of long-term debt Repayments of Long-term Debt Purchases of treasury shares Payments for Repurchase of Common Stock Debt issuance and credit facility origination costs Payments of Debt Issuance Costs Payments of capital lease obligations Repayments of Long-term Capital Lease Obligations Dividends paid Payments of Dividends Intercompany funding Equity Method Investment, Unrealized Intercompany Profit (Loss) Not Eliminated, Amount Net transfers to Valero Contributions From (Distributions To) Valero, Net Net cash contributions from (distributions to) Valero. Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Effect of foreign exchange rate changes on cash Effect of Exchange Rate on Cash and Cash Equivalents Net (decrease) increase in cash Cash, Period Increase (Decrease) Cash at beginning of year Cash at end of year Effective federal income tax rate percent Effective tncome tax rate, percent Income tax expense Deferred Tax Liabilities, Net Deferred Tax Liabilities, Net Tax Credit Carryforward, Amount Tax Credit Carryforward, Amount Deferred State and Local Income Tax Expense (Benefit) Deferred Tax Assets, Operating Loss Carryforwards, State and Local Deferred Tax Assets, Operating Loss Carryforwards, State and Local Operating Loss Carryforwards, Valuation Allowance Operating Loss Carryforwards, Valuation Allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Unrecognized Tax Benefits Unrecognized Tax Benefits Income Tax Examination, Penalties and Interest Expense Income Tax Examination, Penalties and Interest Expense Undistributed Earnings of Foreign Subsidiaries Undistributed Earnings of Foreign Subsidiaries Income Taxes Paid Income Taxes Paid Fair Value Measurements Disclosure Fair Value Disclosures [Text Block] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset retirement obligations as of beginning of year Asset Retirement Obligation Acquisition of CrossAmerica Asset Retirement Obligation, Liabilities Incurred Additions to accrual Asset Retirement Obligation, Period Increase (Decrease) Accretion expense Asset Retirement Obligation, Accretion Expense Settlements Asset Retirement Obligation, Liabilities Settled Foreign currency translation Asset Retirement Obligation, Foreign Currency Translation Asset retirement obligations as of end of year Less current portion (included in accrued expenses) Asset retirement obligations, less current portion Schedule of Accrued Liabilities [Table Text Block] Schedule of Accrued Liabilities [Table Text Block] Schedule of Other Assets and Other Liabilities [Table Text Block] Other Noncurrent Liabilities [Table Text Block] Schedule of Changes in Asset Retirement Obligations [Table Text Block] Schedule of Change in Asset Retirement Obligation [Table Text Block] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Cash Inventories Deferred income taxes Prepaid expenses and other Property and equipment, at cost Accumulated depreciation Investments in subsidiaries Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Other assets, net Current portion of debt and capital lease obligations Accounts payable Accrued expenses Taxes other than income taxes Debt and capital lease obligations, less current portion Intercompany payables (receivables) Intercompany Liabilities Intercompany payables (receivables). Asset retirement obligations Other long-term liabilities Common stock APIC Treasury stock AOCI Stockholders' Equity Attributable to Parent Earnings Per Share Disclosure Earnings Per Share [Text Block] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Income Statement [Abstract] Cost of sales Cost of Goods Sold Gross profit Operating expenses: Operating Expenses [Abstract] Operating expenses Selling Expense General and administrative expenses General and Administrative Expense Asset impairments Asset Impairment Charges Total operating expenses Operating Expenses Gain on the sale of assets, net Gain (Loss) on Disposition of Assets Other income, net Other Nonoperating Income (Expense) Interest expense Interest Expense Income before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Net loss attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to CST stockholders Net Income (Loss) Attributable to Parent Earnings per common share Earnings Per Share, Basic [Abstract] Weighted-average common shares outstanding (in thousands) Weighted Average Number of Shares Outstanding, Basic Earnings per common share - assuming dilution Earnings Per Share, Diluted [Abstract] Weighted-average common shares outstanding - assuming dilution (in thousands) Weighted Average Number of Shares Outstanding, Diluted Dividends per common share Common Stock, Dividends, Per Share, Declared Supplemental information: Supplemental Income Statement Elements [Abstract] (a) Includes excise taxes Excise and Sales Taxes Equity [Abstract] Equity Disclosure Stockholders' Equity Note Disclosure [Text Block] Schedule of Related Party Transactions [Table Text Block] Schedule of Related Party Transactions [Table Text Block] Reconciliation Of Net Change In Net Parent Company Investment [Table Text Block] Reconciliation Of Net Change In Net Parent Company Investment [Table Text Block] Tabular disclosure of the reconciliation of net change in net parent investment. Property, Plant and Equipment, Useful Life Property, Plant and Equipment, Useful Life Dividends [Axis] Dividends [Axis] Dividends [Domain] Dividends [Domain] Quarterly Quarterly [Member] Event recurring quarterly Dividends Dividends Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Useful Life [Axis] Useful Life [Axis] Useful Life of intangible asset Useful Life [Domain] Useful Life [Domain] [Domain] for Useful Life of intangible asset 10 year life 10 year life [Member] 10 year life for wholesale fuel supply contracts, wholesale fuel distribution rights and trademarks 5 year life - Covenants 5 year life - Covenants [Member] 5 year life of intangible assets for covenants not to compete 5 year life - above and below market leases 5 year life - above and below market leases [Member] 5 year life - above and below market leases 15 year life 15 year life [Member] 15 year life of stepped up intangible assets Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Asset, Useful Life Amortization of intangible assets Amortization of Intangible Assets Projected amortization expense, 2015 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Projected amortization expense, 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Two Projected amortization expense, 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Three Projected amortization expense, 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Four Projected amortization expense, 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Five Statement of Cash Flows [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Stock-based compensation expense Share-based Compensation Depreciation, amortization and accretion expense Depreciation, Depletion and Amortization Gain on the sale of assets, net Deferred income tax expense (benefit) Changes in working capital Increase (Decrease) in Other Current Assets and Liabilities, Net Other operating activities, net Other Operating Activities, Cash Flow Statement Net cash provided by operating activities CST acquisition of Nice N Easy Acquisition of the Crackerbox Payments to Acquire Business Two, Net of Cash Acquired CrossAmerica acquisition of Nice N Easy Other investing activities, net Net Cash Provided by (Used in) Investing Activities, Continuing Operations Payments of long-term debt Debt issuance and credit facility origination costs Payment of Financing and Stock Issuance Costs Dividends and distributions paid Net increase (decrease) in cash Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Line Items] Class of Stock [Line Items] Schedule of Stock by Class [Table Text Block] Schedule of Stock by Class [Table Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Property and Equipment Disclosure Property, Plant and Equipment Disclosure [Text Block] Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Line of Credit Facilities [Table Text Block] Schedule of Line of Credit Facilities [Table Text Block] Indefinite-lived intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Finite-lived intangible assets (CrossAmerica: $370 net as of December 31, 2014) Finite-Lived Intangible Assets, Gross Finite-lived intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Total, gross carrying amount Intangible Assets, Gross (Excluding Goodwill) Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Balance as of beginning of year Allowance for Doubtful Accounts Receivable Acquisitions Business Combination, increase (decrease) in allowance for account receivable The increase or decrease in allowance for account receivable through the consolidation or acquisition of a business entity. Increase in allowance charged to expense Allowance for Doubtful Accounts Receivable, Period Increase (Decrease) Allowance for Doubtful Accounts Receivable, Write-offs Allowance for Doubtful Accounts Receivable, Write-offs Balance as of end of year Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Common stock, shares authorized Common Stock, Shares Authorized Common stock, par or stated value per share Common Stock, Par or Stated Value Per Share Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Treasury Stock, Shares Treasury Stock, Shares Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Balance at beginning of period Other comprehensive (loss) income before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Amounts reclassified from other comprehensive income Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Balance at end of period Stock Options and Restricted Stock Units (RSUs) Stock Options and Restricted Stock Units (RSUs) [Member] Stock Options and Restricted Stock Units (RSUs) [Member] Allocated Share-based Compensation Expense Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Valuation Technique [Axis] Valuation Technique [Axis] Valuation Technique [Domain] Valuation Technique [Domain] Income Approach Valuation Technique Income Approach Valuation Technique [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Nonrecurring Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Property and equipment, valuation techniques Fair Value Measurements, Valuation Techniques Property and equipment, fair value Property, Plant, and Equipment, Fair Value Disclosure Property and equipment, net book value Property and equipment, impairment Schedule of Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Environmental liabilities (CrossAmerica: $1 as of December 31, 2014) Accrued Environmental Loss Contingencies, Noncurrent Self-insurance accruals (see Note 15) Self Insurance Reserve, Noncurrent Other (CrossAmerica: $15 as of December 31, 2014) Other Accrued Liabilities, Noncurrent Total other long-term liabilities Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] Revenue from External Customers by Products and Services [Table Text Block] Revenue from External Customers by Products and Services [Table Text Block] Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] Reconciliation of Assets from Segment to Consolidated [Table Text Block] Reconciliation of Assets from Segment to Consolidated [Table Text Block] Net Parent Investment Net Parent Investment [Member] Prepresents the net investment of a subsidiary into the parent company. Net transfers to Parent per statements of changes in net investment Net Transfers From (To) Valero Net cash transfers from (to) Valero. Net transfers of assets and liabilities with Valero Net transfer of assts and liabilities, Related Party Net transfer of assts and liabilities with a related party during a business combination or separation. Net transfers to Valero per statements of cash flows Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Common Stock Common Stock [Member] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Less dividends declared: Common stock Undistributed earnings Undistributed Earnings, Basic Earnings per share, distributed earnings Earnings Per Share, Basic, Distributed Earnings per share, undistributed earnings Earnings Per Share, Basic, Undistributed Total earnings per common share Commitments and Contingencies Disclosure Commitments and Contingencies Disclosure [Text Block] Share-based compensation for services provided prior to legal separation Share-based Compensation for Services Provided Prior to Legal Separation The aggregate amount of noncash, equity-based employee remuneration allocated to employees from a former related entity for services performed before legal separation. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Share-based compensation arrangement by share-based payment award, number of shares available for grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Changes in Allowance for Doubtful Accounts Allowance for Credit Losses on Financing Receivables [Table Text Block] Reportable Segments Operating Segments [Member] Reportable segment assets Receivables, net Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Litigation Status [Axis] Litigation Status [Axis] Litigation Status [Domain] Litigation Status [Domain] Pending Litigation Pending Litigation [Member] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] State of Colorado Litigation State of Colorado Litigation [Member] State of Colorado Litigation Loss Contingencies [Line Items] Loss Contingencies [Line Items] Loss Contingency, Lawsuit Filing Date Loss Contingency, Lawsuit Filing Date Loss Contingency, Name of Defendant Loss Contingency, Name of Defendant Loss Contingency, Damages Sought, Value Loss Contingency, Damages Sought, Value Self Insurance Reserve Self Insurance Reserve Condensed Income Statement [Table] Condensed Income Statement [Table] Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Operating expenses: Costs and Expenses [Abstract] Operating Income (Loss) Equity in earnings of subsidiaries Temporary Equity, Interest in Subsidiary Earnings Income (loss) before income tax expense Net income (loss) Net income attributable to CST Foreign currency translation adjustment Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Debt Instrument, Redemption, Requirements by Criteria [Axis] Debt Instrument, Redemption, Requirements by Criteria [Axis] Information about the criteria for required debt redemption under the terms of the debt agreement. Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Asset Sale Asset Sale [Member] Debt redemption required by asset sales as defined by the debt agreement. Change of Control Change of Control [Member] Debt redemption required by a change of control as defined by the debt agreement. Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Alternate Base Rate Alternate Base Rate [Member] Alternate base interest rate as defined under the credit facility. Term Loan Notes Payable to Banks [Member] Security Interests in the Capital Stock of Domestic Subsidiaries Security Interests in the Capital Stock of Domestic Subsidiaries Security interests in the capital stock of domestic subsidiaries. Security Interests in the Voting Equity Interests of Foreign Subsidiaries Security Interests in the Voting Equity Interests of Foreign Subsidiaries Security interests in the voting equity interests of foreign subsidiaries. Security Interests in the Non-Voting Equity Interests of Foreign Subsidiaries Security Interests in the Non-Voting Equity Interests of Foreign Subsidiaries Security interests in the non-voting equity interests of foreign subsidiaries. Debt Instrument, Covenant, Lease Adjusted Leverage Ratio, Maximum Debt Instrument, Covenant, Lease Adjusted Leverage Ratio, Maximum Debt Instrument, Covenant, Lease Adjusted Leverage Ratio, Maximum Allowed Debt Instrument, Covenant, Consolidated Fixed Charge Coverage Ratio, Minimum Debt Instrument, Covenant, Consolidated Fixed Charge Coverage Ratio, Minimum Debt Instrument, Covenant, Consolidated Fixed Charge Coverage Ratio, Minimum Allowed Consolidated Lease Adjusted Leverage Ratio Consolidated Lease Adjusted Leverage Ratio The ratio calculation of total lease adjusted indebtedness to consolidated EBITDAR per the financial covenant. Consolidated Fixed Charge Coverage Ratio Consolidated Fixed Charge Coverage Ratio The ratio calculation of consolidated EBITDA to consolidated fixed charges per the financial covenant. Line of credit facility, interest rate at period end Line of Credit Facility, Interest Rate at Period End Banking Fees and Commissions Banking Fees and Commissions Statement of Stockholders' Equity [Abstract] Additional Paid-in Capital Additional Paid-in Capital [Member] Treasury Stock Treasury Stock [Member] Retained Earnings Retained Earnings [Member] Noncontrolling Interest Noncontrolling Interest [Member] Stockholders' equity at beginning of year Net income Net transfers to Valero Issuance of stock at the spin-off Stock Issued During Period, Value, New Issues Reclassification of net investment to APIC Adjustment to Additional Paid in Capital from Net Parent Investment Represents increases or decreases in additional paid in capital from net parent investment Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Stock-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Net loss attributable to noncontrolling interest Shares issued in connection with purchase of CrossAmerica GP Purchase and IDR Purchase Stock Issued During Period, Value, Acquisitions Stock repurchases under buyback program Stock Repurchased During Period, Value Distributions to noncontrolling interest Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Stockholders' equity at end of year Stockholders' Equity Attributable to Noncontrolling Interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Tax credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards Net operating losses (NOLs) Deferred Tax Assets, Operating Loss Carryforwards Lease financing obligation Deferred Tax Assets, Tax Deferred Expense, Other Inventories Deferred Tax Assets, Inventory Unpaid insurance reserve Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals Accrued expenses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Property and equipment Deferred Tax Assets, Property, Plant and Equipment Intangibles Deferred Tax Assets, Goodwill and Intangible Assets Other assets Deferred Tax Assets, Other Total deferred income tax assets Deferred Tax Assets, Gross Less: Valuation allowance Deferred Tax Assets, Valuation Allowance Net deferred income tax assets Deferred Tax Assets, Net of Valuation Allowance Property and equipment Deferred Tax Liabilities, Property, Plant and Equipment Deferred Tax Liabilities, Intangible Assets Deferred Tax Liabilities, Intangible Assets Other Deferred Tax Liabilities, Other Total deferred income tax liabilities Deferred Tax Liabilities, Gross, Noncurrent Net deferred income tax assets (liabilities) Deferred Tax Assets, Net Less: Current deferred income tax asset Deferred Tax Assets, Net of Valuation Allowance, Current Less: Non-current deferred income tax asset Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Non-current deferred income tax liability Segment Information Disclosure Segment Reporting Disclosure [Text Block] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Long-lived assets Long-Lived Assets Allowance for doubtful accounts receivable Allowance for Doubtful Accounts Receivable, Current Schedule of Long Lived Assets Held-for-sale [Table] Schedule of Long Lived Assets Held-for-sale [Table] Long Lived Assets Held-for-sale by Asset Type [Axis] Long Lived Assets Held-for-sale by Asset Type [Axis] Long Lived Assets Held-for-sale, Name [Domain] Long Lived Assets Held-for-sale, Name [Domain] Long Lived Assets Held-for-sale [Line Items] Long Lived Assets Held-for-sale [Line Items] Minimum rental expense (CrossAmerica: $5 for the year ended December 31, 2014) Operating Leases, Rent Expense, Minimum Rentals Contingent rental expense Operating Leases, Rent Expense, Contingent Rentals Total rental expense Operating Leases, Rent Expense Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Stock options (in thousands) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Restricted stock (in thousands) Incremental common shares attributable to participating nonvested shares with non-forfeitable dividend rights- restricted stock This element represents nonvested restricted stock that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method. Restricted stock units (in thousands) Incremental common shares attributable to participating nonvested shares with non-forfeitable dividend rights- restricted stock units This element represents nonvested restricted stock units that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method. Weighted-average common shares outstanding - assuming dilution (in thousands) Earnings per common share - assuming dilution Schedule of Capital Leased Assets [Table] Schedule of Capital Leased Assets [Table] Capital Leased Assets [Line Items] Capital Leased Assets [Line Items] 2015 Capital Leases, Future Minimum Payments Due, Next Twelve Months 2016 Capital Leases, Future Minimum Payments Due in Two Years 2017 Capital Leases, Future Minimum Payments Due in Three Years 2018 Capital Leases, Future Minimum Payments Due in Four Years 2019 Capital Leases, Future Minimum Payments Due in Five Years Thereafter Capital Leases, Future Minimum Payments Due Thereafter Total minimum rental payments Capital Leases, Future Minimum Payments Due Less amount representing interest Capital Leases, Future Minimum Payments, Interest Included in Payments Net minimum rental payments Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments Condensed Balance Sheet Condensed Balance Sheet [Table Text Block] Condensed Income Statement Condensed Income Statement [Table Text Block] Condensed Cash Flow Statement Condensed Cash Flow Statement [Table Text Block] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] 2015 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2016 Long-term Debt, Maturities, Repayments of Principal in Year Two 2017 Long-term Debt, Maturities, Repayments of Principal in Year Three 2018 Long-term Debt, Maturities, Repayments of Principal in Year Four 2019 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Total Scenario, Adjustment Scenario, Adjustment [Member] Ownership interest retained by Valero as a result of the spin off Spinoff Transaction Ownership Percentage Retained by Parent Company The equity interest Valero initially retained related to the spinoff of CST Brands, Inc. Accounts receivable, related parties, noncurrent Accounts Receivable, Related Parties, Noncurrent Deferred tax assets, gross Operating Leases, Rent Expense Management Fees Revenue Management Fees Revenue Excess of replacement or current costs over stated LIFO value Excess of Replacement or Current Costs over Stated LIFO Value Trade receivables (CrossAmerica:$35 as of December 31, 2014) Accounts Receivable, Gross, Current Other Other Receivables, Gross, Current Total receivables Accounts Receivable, Gross Allowance for doubtful accounts Receivables, net Receivables, Net, Current Decrease (increase) in Operating Assets: Increase (Decrease) in Operating Assets [Abstract] Receivables, net Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Prepaid expenses and other Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Operating Liabilities [Abstract] Increase (Decrease) in Operating Liabilities [Abstract] Accounts payable Increase (Decrease) in Accounts Payable Accounts payable to Valero Increase (Decrease) in Accounts Payable, Trade Accrued expenses Increase (Decrease) in Accrued Liabilities Taxes other than income taxes Increase (Decrease) in Property and Other Taxes Payable Income taxes payable Increase (Decrease) in Income Taxes Payable Changes in working capital Investment Geographic Region [Axis] Investment Geographic Region [Axis] Location [Domain] Location [Domain] San Antonio San Antonio [Member] San Antonio, TX [Member] Austin Austin [Member] Austin, TX Acquisition of Landmark Industries Stores Acquisition of Landmark Industries Stores [Member] Acquisition of Landmark Industries Stores [Member] Acquisition of Erickson Oil Products Acquisition of Erickson Oil Products [Member] Acquisition of Erickson Oil Products [Member] Phantom units outstanding Employee Benefit Plans Disclosure Compensation and Employee Benefit Plans [Text Block] Extinguishment of Debt [Axis] Extinguishment of Debt [Axis] Amount due each of the next five years Amount due each of the next five years [Member] Amount due each of the next five years. Notes Payable, Other Payables Notes Payable, Other Payables [Member] Notes Payable Notes Payable Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Contractual Obligation Contractual Obligation Principles of Consolidation and Combination Consolidation, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Receivables Receivables, Policy [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Impairment of Assets Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Business Combinations and Other Purchase of Business Transactions, Policy [Policy Text Block] Business Combinations and Other Purchase of Business Transactions, Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Environmental Matters Regulatory Environmental Costs, Policy [Policy Text Block] Asset Retirement Obligations Asset Retirement Obligations, Policy [Policy Text Block] Foreign Currency Transactions Foreign Currency Transactions and Translations Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Shipping and Handling Costs Shipping and Handling Cost, Policy [Policy Text Block] Lease Accounting Lease, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Vendor Allowances and Rebates Cost of Sales, Vendor Allowances, Policy [Policy Text Block] Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Cost of Sales Cost of Sales, Policy [Policy Text Block] Motor Fuel Taxes Policy [Policy Text Block] Motor Fuel Taxes Policy [Policy Text Block] Disclosure of the accounting policy for motor fuel taxes addresses the accounting treatment of regulatory taxes in the financial statements and how these taxes are remitted to regulatory authorities. [Policy Text Block] Earnings Per Common Share Earnings Per Share, Policy [Policy Text Block] Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Assets identified as possible future for sales Assets Identified as Possible Future For Sale [Member] Assets identified as possible future sales [Member] Assets Held-for-sale Assets Held-for-sale [Member] Sale of held-for-sale assets Sale of held-for-sale assets [Member] Sale of held-for-sale assets [Member] Number of sites classified as assets held for sale Related Party Disclosure Related Party Transactions Disclosure [Text Block] Asset Impairments Disclosure Asset Impairment Charges [Text Block] Expected term (years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected stock price volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected dividend yield rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Description of Business, Basis of Presentation, Concentration Risk and Other Items Affecting Our Business Disclosure Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]